True but no telling when that craft option will appear but I will look for it now. Totally forgot that sourceCrafting a Festival Merchant for seeds is better than a Level 1 Sunset Towers for seeds (ignoring the decay boost). Everyone's seed/decay rate is going to be different, but I'd need ~3 days of seed inventory for the decay boost to actually make it better than a craftable building.
Granted you could always level the wonder to make it better. Though there are some other alternatives if you're short on seeds.
and the do not geatively impact your spire / tournaments and do not cost a ton of KPAt Main Hall lvl 35, at 3 rewards daily, my Sunset Tower would become useful at lvl 11, providing then 35 (Main Hall) * 54 (Multiplier) = 1890 seeds * 3 (neighbourhood helps) daily (24 hrs) on 7*3=21 tiles, thus providing (35*54*3)/(24*21)=11.25 Seeds/Sq/Hr, beating Festival Merchants (Lvl 16) giving 10.7 seeds per sq/hr. Lvl 10 ST would give 10.0 seeds/sq/hr.
It beats smaller event buildings before then, but those are easier to place in gaps, and you likely wouldn't have 21 tiles worth.